General Description
These valves regulate flow by means
of an adjustable orifice which is not
pressure compensated, and flow
through the valve is entirely dependent
upon pressure drop at any particular
setting of the orifice.
Dual service-line models with an integral
non-return valve around each control
orifice provide for meter-in or meter-out
control; single line versions of these are
available.
For flow restriction in P or T lines (where
reverse free flow is not required) models
without check valves are available.
Adjustment options are either
screw/locknut or handknob.
Flow Restrictor Valves
DGMFN-3-4*
Functional Symbols
Typical Section
PTBA
DGMFN-3-X-A**-B**
DGMFN-3-Y-A**-B**
DGMFN-3-Z-P**
DGMFN-3-Z-T**
PTBA
PTBA
PTBA
Model Code for Flow Restrictor Valves
DGMFN-3- 4*
1
3 5 6
2
**
21
(-
7
-* *
4
***)-
8
Direction of flow control (with
respect to machine actuator)
X = Meter-in control, applicable to lines
A and B
Y = Meter-out control, applicable to
lines A and B
Z = Meter-in control, line P only and
meter-out control, line T only.
Location of control function
(single model or first line of dual
model)
P = Line P (single model only)
T = Line T (single model only)
A = Line A (single model or first line of
dual model)
B = Line B (single model only)
Type of control needle/orifice
(single model or first line of dual
model)
1 = Fine control
2 = Standard control
Adjuster type (single model or
first line of dual model)
H = Handknob
W = Screw/locknut
Control in second line
B = Line B (use for dual models with
“A” specified at )
Omit for single models
Type of control needle/orifice
(second line of dual models)
Options as in
Omit for single models
Adjuster type (second line of dual
models)
Options as in
Omit for single models
Design number, 40 series
Subject to change. Installation
dimensions unaltered for design
numbers 40 to 49 inclusive.
3
4
5
2
3
6
7
4
8
19
Performance Characteristics
Pressure Drop
Typical performance with mineral oil at 21 cSt (102 SUS) and at 50_C(122_F)
Type “1” needle (see model codes and )
Type “2” needle (see model codes and )
Free flow through check valve
3 6 3 6
0
bar
50 6040302010 L/min
0 4 8 12 16 USgpm
0
psi
Flow rate
30
200
400
Pressure drop
Number of turns of adjuster
123 4 5 6
10
20
40
50
60
600
800
0
bar
50 6040302010 L/min
0 4 8 12 16 USgpm
0
psi
Flow rate
30
200
400
Pressure drop
Number of turns of adjuster
12 3 4
5
6
10
20
40
50
60
600
800
0
bar
50 6040302010 L/min
0 4 8 12 16 USgpm
0
psi
Flow rate
200
Pressure drop
150
100
50
14
2
4
6
8
10
12
For other viscosities see “Further Information”.
20
DGMFN-3-X-***(-***)-4*
DGMFN-3-Y-***(-***)-4*
DGMFN-3-Z-***-4*
Models with type W adjuster
To adjust valve setting, slacken off locknut and turn
screw . Re-tighten locknut after completing
adjustment.
Turn clockwise to decrease flow (increase restriction);
counter-clockwise to increase flow (reduce restriction).
Model A B C D E
DGMFN-3-X-A*W-4* 121 (4.76) –––16,75 (0.7)
DGMFN-3-X-A*W-B*W-4* ––167 (6.6) – 16,75 (0.7)
DGMFN-3-X-B*W-4* – 122 (4.8) ––16,75 (0.7)
DGMFN-3-Y-A*W-4* 121 (4.76) –––23,25 (0.9)
DGMFN-3-Y-A*W-B*W-4* ––167 (6.6) – 23,25 (0.9)
DGMFN-3-Y-B*W-4* – 122 (4.8) ––23,25 (0.9)
DGMFN-3-Z-P*W-4* –––123 (4.8) 16,75 (0.7)
DGMFN-3-Z-T*W-4* –––123 (4.8) 23,25 (0.9)
Installation Dimensions in mm (inches)
A
P
B
T
A
P
B
T
A
P
B
T
Line B or line P adjustment
(according to model type)
39 (1.54)
76 (3)
C max.
45 (1.8)
max.
47,6
(1.87)
46
(1.8)
4 off “O” seals supplied for this interface4 holes through: Ø5,3 (0.21 dia)
A max.
4 (
5
/
32
) A/F hex. socket
40
(1.57)
3,5 (0.14)
Ø3 (0.12 dia)
E max.
12,7 (
1
/
2
) A/F hex. locknut .
Torque to 25-30 Nm (18-22 lbf ft)
Line A or line T adjustment
(according to model type)
B max.
D max.
47 (1.85)
max.
E max.
56 (2.2)
max.
Ø32 (1.26 dia)
M4 locking screw
2 (
5
/
64
) A/F hex. socket
Type H adjuster
21
